JP2015042880A - Fluid pressure cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pressure cylinder incorporating a sequence valve mechanism to be opened under conditions that an output member is located at a prescribed position and a fluid pressure in a fluid pressure working chamber reaches a prescribed pressure.SOLUTION: A hydraulic cylinder 2 for driving a clamp device 1 is composed of a cylinder body 5, a piston member 3 mounted on the cylinder body so that it can be advanced and retracted, a hydraulic working chamber 8b for driving the piston member to an advancing side, a fluid passage 20 formed in a wall portion of the cylinder body, connected to a fluid pressure supply source at one end, and connected to an external fluid pressure apparatus at the other end, and a sequence valve mechanism 30 capable of opening and closing a midway portion of the fluid passage. The sequence valve mechanism 30 has a valve element capable of opening and closing the fluid passage, a valve closing spring 33 for biasing the valve element to a valve closing side, and a valve driving mechanism 34 for bringing the valve element into a valve opening driveable state by an oil pressure in the hydraulic working chamber 8b when the piston member is moved to a prescribed clamp position.

Description

  The present invention relates to a fluid pressure cylinder, and includes a fluid passage that connects an external fluid pressure supply source to an external actuator, and a sequence valve mechanism that can open and close the fluid passage when the output member moves to a predetermined position. The present invention relates to a fluid pressure cylinder in which a sequence valve mechanism is opened by fluid pressure in a pressure working chamber.

  Conventionally, various types of clamping devices including a hydraulic cylinder for clamping various clamping objects have been put into practical use. The fluid pressure cylinders of these clamping devices include a cylinder body, an output member equipped to be able to advance and retract in the cylinder body, and a fluid pressure working chamber for driving the output member to at least one of the advance side and the retract side. And the output member is driven using a pressurized fluid such as pressurized oil or pressurized air.

By the way, when the operation of the fluid pressure cylinder and other fluid pressure devices are operated in cooperation, a sequence valve connected to the fluid pressure circuit of the fluid pressure cylinder is provided outside the fluid pressure cylinder so that the fluid pressure cylinder operates. A technique for switching the sequence valve in conjunction with each other is known.
Also known is a technique in which a sequence valve is provided inside the fluid pressure cylinder, and the sequence valve is opened or closed when the fluid pressure supply port of the fluid pressure cylinder or the fluid pressure in the fluid pressure working chamber reaches a predetermined pressure. is there.

  For example, the hydraulic lock device of Patent Document 1 is provided with a hydraulic cylinder that moves the rod in the axial direction, an annular pressure booster that pressurizes oil in the outer hydraulic chamber, and a hydraulic pressure on the case member. A hydraulic pressure supply port that supplies hydraulic pressure to the input oil chamber of the cylinder and pressure intensifier is provided, and the spring force of the valve closing spring after the hydraulic pressure in the hydraulic pressure supply port rises to a predetermined pressure in the oil passage that leads from the hydraulic pressure supply port to the input oil chamber A sequence valve that opens against the pressure is provided, and the operation start of the pressure intensifier is delayed via this sequence valve, and the sequence is arranged inside the check valve that can discharge hydraulic pressure from the input oil chamber to the hydraulic pressure supply port. An example incorporating a valve is disclosed.

JP 2001-271809 A

  In the hydraulic lock device of Patent Document 1, the sequence valve is switched to the valve open position after the fluid pressure in the fluid pressure supply port rises to a predetermined pressure. As described above, when the structure in which the sequence valve is opened / closed by using the fluid pressure at a predetermined portion in the fluid pressure cylinder as a trigger, the sequence valve may not be able to be opened / closed in association with the position of the output member of the fluid pressure cylinder. Absent. Therefore, even if the output member does not operate normally due to some failure of the fluid pressure cylinder, the sequence valve opens and closes due to the fluid pressure, which hinders the cooperative operation between the fluid pressure cylinder and other fluid pressure devices. There is a case.

  An object of the present invention is to provide a fluid pressure cylinder incorporating a sequence valve mechanism that opens on condition that the output member is located at a predetermined position and the fluid pressure in the fluid pressure working chamber reaches a predetermined pressure. is there.

  The fluid pressure cylinder according to claim 1 is a cylinder main body, an output member mounted on the cylinder main body so as to be able to advance and retract, and a fluid pressure working chamber for driving the output member to at least one of the advancing side and the retracting side. A fluid passage formed in the wall of the cylinder body, wherein one end is connected to a fluid pressure supply source and the other end is connected to an external fluid pressure device; A sequence valve mechanism capable of opening and closing a middle portion of the fluid passage, and the sequence valve mechanism includes a valve body capable of opening and closing the fluid passage, and a valve closing spring for biasing the valve body toward a valve closing side, And a valve drive mechanism that enables the valve body to be driven to open by the fluid pressure in the fluid pressure working chamber when the output member moves to a predetermined position.

  According to a second aspect of the present invention, there is provided the fluid pressure cylinder according to the first aspect of the invention, wherein the valve driving mechanism is configured to prevent the valve from resisting a spring force of the valve closing spring after the fluid pressure in the fluid pressure working chamber has increased to a predetermined pressure. It is characterized by being configured to switch the body to the valve open position.

  A fluid pressure cylinder according to a third aspect is the invention according to the second aspect, wherein the valve driving mechanism is mounted in a mounting hole formed in a wall portion of the cylinder body, and is movably mounted in the mounting hole in the axial direction. Via a valve driving member capable of opening a valve body, a pressure receiving portion that is formed in the valve driving member and receives the fluid pressure of the fluid pressure working chamber, and a steel ball that contacts the cam portion of the output member It has the cooperation mechanism which cooperates an output member and the said valve drive member, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, there is provided the fluid pressure cylinder according to the third aspect, wherein the cooperating mechanism includes a holding hole formed in the cylinder body, a steel ball held movably in the radial direction in the holding hole, and the An annular engagement recess formed in the valve drive member and partially engageable with the steel ball, and a cam portion formed in the output member, the cam portion engaging the steel ball with the annular engagement A steel ball pushing portion that pushes toward the concave portion; and a steel ball receiving portion that can partially accommodate the steel ball. The steel ball pushing portion pushes the steel ball toward the annular engagement concave portion. When the output member moves to a predetermined position, the steel ball is accommodated in the steel ball receiving portion, and the valve drive member opens the valve body. It is characterized by being in a drivable state.

  The fluid pressure cylinder of claim 5 is characterized in that, in the invention of claim 1, a spring force adjusting member capable of adjusting a spring force of the valve closing spring is provided.

  The fluid pressure cylinder of claim 6 is characterized in that, in the invention of claim 1, an upstream side of the sequence valve mechanism in the fluid passage communicates with the fluid pressure working chamber.

  A fluid pressure cylinder according to a seventh aspect is characterized in that, in the invention according to the first aspect, a check valve for allowing a flow of fluid pressure in a discharge direction is incorporated in the valve body.

  A fluid pressure cylinder according to an eighth aspect is the check according to the first aspect, wherein a bypass passage that bypasses the sequence valve mechanism is provided in the fluid passage, and the flow in the discharge direction of the fluid pressure is allowed in the bypass passage. It is characterized by the provision of a valve.

  The fluid pressure cylinder according to claim 9 is characterized in that, in the invention according to claim 1, the predetermined position is a clamp position in a fluid pressure cylinder for driving a clamp device.

  According to the invention of claim 1, a fluid passage formed in the wall portion of the cylinder body, wherein one end is connected to a fluid pressure supply source and the other end is connected to an external fluid pressure device; A sequence valve mechanism capable of opening and closing a middle portion of the fluid passage, and the sequence valve mechanism is operated by a fluid pressure when the output member moves to a predetermined position, a valve body capable of opening and closing the fluid passage, a valve closing spring, A valve drive mechanism that enables the valve body to be driven to open by the fluid pressure in the chamber, so that when the output member moves to a predetermined position, the sequence valve mechanism is opened by the fluid pressure in the fluid pressure working chamber. And the fluid passage can be opened.

  Therefore, the sequence valve mechanism can be opened on the condition that the output member has moved to a predetermined position and the fluid pressure in the fluid pressure working chamber has risen, so the cooperative operation between the fluid pressure cylinder and another fluid pressure device is possible. The operational certainty of the can be improved.

  According to the second aspect of the present invention, the valve drive mechanism moves the valve body to the valve open position against the spring force of the valve closing spring by the valve drive mechanism after the fluid pressure in the fluid pressure working chamber rises to a predetermined pressure. Since it is configured to switch, the same effect as in claim 1 can be obtained.

  According to the invention of claim 3, the valve drive mechanism includes a mounting hole formed in the wall portion of the cylinder body, a valve driving member that is movably mounted in the mounting hole in the axial direction and that can open the valve body. A pressure receiving portion that is formed in the valve drive member and receives the fluid pressure of the fluid pressure working chamber, and a cooperating mechanism that causes the output member and the valve drive member to cooperate via a steel ball that contacts the cam portion of the output member; Therefore, the output member and the valve driving member can be reliably operated in a coordinated manner.

  According to the invention of claim 4, when the steel ball is pushed by the steel ball pushing portion toward the annular engagement concave portion, the movement of the valve drive member is restricted, and when the output member moves to a predetermined position, Since the ball is accommodated in the steel ball receiving portion and the valve driving member is in a state in which the valve body can be driven to open, the output member and the valve body can be operated in cooperation by a simple mechanism

  According to the invention of claim 5, since the spring force adjusting member capable of adjusting the spring force of the valve closing spring is provided, the versatility of the valve drive mechanism can be enhanced.

  According to the sixth aspect of the present invention, since the upstream side of the sequence valve mechanism in the fluid passage communicates with the fluid pressure working chamber, the fluid pressure supply system for supplying fluid pressure to the fluid passage and the fluid pressure working chamber is simplified.

  According to the seventh aspect of the present invention, since the check valve that allows the flow of the fluid pressure in the discharge direction is incorporated in the valve body, the output member moves in the discharge direction even when the position of the output member fluctuates from the predetermined position. Fluid pressure can flow.

  According to the eighth aspect of the present invention, the bypass passage for bypassing the sequence valve mechanism is provided in the fluid passage, and the check valve for allowing the flow of the fluid pressure in the discharge direction is provided in the bypass passage. Similarly, even when the position of the output member varies from the predetermined position, the fluid pressure can flow in the discharge direction.

  According to the invention of claim 9, since the predetermined position is a clamp position in the fluid pressure cylinder for driving the clamp device, the sequence valve mechanism is reliably opened when the output member reaches the clamp position. Can do.

It is sectional drawing of the clamp apparatus (unclamped state) which concerns on Example 1 of this invention. It is an enlarged view of the A section of FIG. It is sectional drawing of a clamp apparatus (clamp start state). It is an enlarged view of the B section of FIG. It is sectional drawing of a clamp apparatus (clamp state). It is an enlarged view of the C section of FIG. FIG. 2 is a fluid pressure circuit diagram of the clamp device of FIG. 1 and an external fluid pressure device. It is sectional drawing of the clamp apparatus (unclamped state) which concerns on Example 2. FIG. It is an enlarged view of the D section of FIG. FIG. 9 is a hydraulic circuit diagram of the clamping device of FIG. 8. It is sectional drawing of the clamp apparatus (unclamped state) which concerns on Example 3. FIG. FIG. 12 is a hydraulic circuit diagram of the clamping device of FIG. 11. It is sectional drawing of the clamp apparatus (unclamped state) which concerns on Example 4. FIG. It is an enlarged view of the E section of FIG. It is sectional drawing of a clamp apparatus (clamp state). It is an enlarged view of the F section of FIG.

Hereinafter, modes for carrying out the present invention will be described based on examples.
In the following embodiments, “hydraulic pressure” may mean compressed oil (pressurized oil).

The link type clamp device of the present embodiment will be described with reference to FIGS.
The clamp device 1 includes a hydraulic cylinder 2 (corresponding to a fluid pressure cylinder), a clamp arm 4 whose one end is hinged to an output rod 3b of a piston member 3 (corresponding to an output member) of the hydraulic cylinder 2, and The link-type clamp device includes a link member 6 that connects a middle portion of the clamp arm 4 to the pivot portion 5a of the clamp body 5. Both ends of the link member 6 are pin-coupled via pin members 7a and 7b. The pivot portion 5 a is formed so as to protrude upward from the upper end portion of one end portion of the cylinder body 5.

  The clamp device 1 is a clamped state in which the clamp member 4 presses a workpiece W (workpiece) downward by the clamp arm 4 in a state where the piston member 3 has advanced a predetermined stroke or more from the unclamped state (see FIG. 1) (see FIG. 5). become. When shifting from the unclamped state to the clamped state via the clamp start position shown in FIG. 3, the clamp arm 4 swings about 70 degrees counterclockwise in a front view. When moving from the clamped state to the unclamped state, the clamp arm 4 swings about 70 degrees in the clockwise direction.

First, the hydraulic cylinder 2 will be described.
As shown in FIGS. 1, 3, and 5, the hydraulic cylinder 2 includes a cylinder body 5, a piston member 3, an unclamping hydraulic operating chamber 8a, a clamping hydraulic operating chamber 8b, and a fluid passage. 20 and a sequence valve mechanism 30 and the like.

The cylinder body 5 includes a main cylinder body 5A and a head side end wall member 5B.
The main cylinder body 5A includes an upper cylinder body 5u and a cylindrical cylinder body 5c that extends downward from the lower end of the upper cylinder body 5u. A horizontal mounting surface 5s for installation on the upper surface of the base member 9 is formed at the lower end of the upper cylinder body 5u. A cylindrical cylinder body 5c of the cylinder body 5 is inserted into the mounting hole 9a of the base member 9, and the cylinder body 5 is fixed to the base member 9 with a plurality of bolts.

  The cylinder body 5 is formed with a rod insertion hole 10 having a vertical axis and a cylinder hole 11 communicating with the lower end of the rod insertion hole 10. The lower end side of the cylinder hole 11 is closed by the head side end wall member 5B. A seal member 10 a and a dust seal 10 b are attached to the inner peripheral portion of the rod insertion hole 10. The piston member 3 includes a piston portion 3 a that is slidably mounted in the cylinder hole 11 in the vertical direction, and an output rod 3 b that extends upward from the piston portion 3 a and projects out of the cylinder body 5 from the rod insertion hole 10. ing. A seal member a is attached to the piston portion 3a.

  The upper end portion of the head-side end wall member 5B is fitted into a fitting hole that is continuous with the cylinder hole 11 and sealed with a seal member b. The head side end wall member 5B is fixed to the cylindrical cylinder body 5c with a plurality of bolts. An auxiliary rod 12 that protrudes upward into the cylinder hole 11 to the vicinity of the upper end of the cylinder hole 11 is integrally formed at the central portion of the head-side end wall member 5B. The outer diameter of the auxiliary rod 12 is about 1/4 to 1/3 of the diameter of the cylinder hole 11. The auxiliary rod 12 may be formed as a separate member from the head side end wall member 5B and fixedly attached thereto.

Next, the piston member 3 will be described.
As shown in FIGS. 1 to 6, the piston member 3 is composed of a piston portion 3 a, an output rod 3 b, and a rod insertion hole 13 formed in the central portion of the lower portion of the piston member 3 so as to be open at the base end (lower end). The rod insertion hole 13 into which the auxiliary rod 12 can be inserted even when the piston member 3 reaches the lower limit position (unclamping position) is provided. A cylindrical gap 14 is formed between the inner peripheral surface of the rod insertion hole 13 and the outer peripheral surface of the auxiliary rod 12 so that the hydraulic pressure of the hydraulic operation chamber 8 b is introduced into the rod insertion hole 13.

  The cylinder hole 11 is vertically divided by a piston portion 3a, a hydraulic working chamber 8a for unclamping is formed above the piston portion 3a, and a hydraulic working chamber 8b for clamping is formed below the piston portion 3a. . The lower hydraulic working chamber 8b corresponds to the “fluid pressure working chamber” of the present invention. First and second hydraulic pressure supply ports 15 and 16 are formed in the upper cylinder body 5u, and the first hydraulic pressure supply port 15 is connected to the hydraulic working chamber 8a by a hydraulic passage 15a formed in the wall of the cylinder body 5. The second hydraulic pressure supply port 16 communicates with the hydraulic working chamber 8b through a hydraulic passage 16a formed in the wall of the cylinder body 5, and the first and second hydraulic pressure supply ports 15 and 16 are hydraulic supply sources (not shown) such as hydraulic hoses. Abbreviation).

  As shown in FIGS. 1 to 6, the clamping device 1 is a fluid passage 20 (which corresponds to a “fluid passage”) formed in a wall portion of a cylinder body 5, one end of which supplies an external fluid pressure. A fluid passage 20 is connected to the source and the other end is connected to an external fluid pressure device, and a sequence valve mechanism 30 capable of opening and closing a middle portion of the fluid passage 20 is provided.

  The sequence valve mechanism 30 is incorporated in the head side end wall member 5B, but most of the sequence valve mechanism 30 is incorporated in the auxiliary rod 12 of the head side end wall member 5B. The sequence valve mechanism 30 can open and close the middle portion of the fluid passage 20 and is opened only when the piston member 3 reaches a position where it can be clamped and the hydraulic pressure in the hydraulic working chamber 8b becomes equal to or higher than a predetermined pressure.

Next, the fluid passage 20 and the sequence valve mechanism 30 will be described.
As shown in FIGS. 1 and 2, the sequence valve mechanism 30 includes a valve case 31, a valve body 32 that can open and close the fluid passage 20, and a valve closing spring 33 that biases the valve body 32 toward the valve closing side. When the piston member 3 reaches a predetermined position (clamp start position shown in FIG. 3), a valve drive mechanism 34 that can drive the valve body 32 to open by the hydraulic pressure of the hydraulic operation chamber 8b, and a spring of the valve closing spring 33 And a spring force adjusting member 35 capable of adjusting the force.

The valve case 31 has an upper half cylindrical portion 31a, an intermediate diameter portion 31b, and a lower large diameter portion 31c. The head-side end wall member 5B is formed with a mounting hole 36a that is a cylindrical vertical mounting hole 36a, most of which is formed in the auxiliary rod 12, a medium-diameter hole 36b, and a large-diameter hole 36c. Has been. The cylindrical portion 31a is inserted into the lower half of the mounting hole 36a. The medium diameter portion 31b is mounted in the medium diameter hole 36b, and the large diameter portion 31c is fixed to the large diameter hole 36c by screwing.
A seal member c is attached to the outer peripheral portion of the medium diameter portion 31b. The mounting hole 36 a is a cylindrical hole concentric with the auxiliary rod 12.

The valve case 31 has a passage hole 37 formed in the upper end wall thereof, a valve hole 38 that is continuous with the lower end of the passage hole 37 and has a larger diameter than the passage hole 37, and a screw hole 39 that is continuous with the lower end of the valve hole 38. Is formed. A valve body 32 is movably attached to an upper end portion of the valve hole 38, and a spring force adjusting member 35 is attached to the screw hole 39 so that the position thereof can be adjusted by screwing. A compressed valve closing spring 33 is mounted between the valve body 32 and the spring force adjusting member 35. The spring force of the valve closing spring 33 can be adjusted by adjusting the vertical position of the spring force adjusting member 35.
An annular valve seat 31v located on the outer peripheral side of the passage hole 37 is formed on the lower surface of the upper end wall 31u of the valve case 31, and an annular valve surface 32a that can be in close contact with the annular valve seat 31v is formed on the upper surface of the valve body 32. ing. A plurality of vertical grooves 32 b are formed on the outer periphery of the valve body 32.

  The fluid passage 20 is formed in the wall portion of the head-side end wall member 5B. A connection fitting 40a connected to the external fluid passage 40b is connected to the input port 40 at the upstream end of the fluid passage 20, and the external fluid passage 40b is connected to an external fluid pressure supply source 40s (in this embodiment, pressurized air supply). Source). A connection fitting 41a connected to the external fluid passage 41b is connected to the output port 41 at the downstream end of the fluid passage 20, and the external fluid passage 41b is connected to an external fluid pressure device (see FIG. 7).

  The fluid passage 20 includes a horizontal passage 20a communicating with the input port 40, a transverse passage 20b formed in the medium diameter portion 31b, an annular passage 20c connected to the upper end of the screw hole 39, a valve hole 38, a passage hole 37, A cylindrical passage 20d between the inner peripheral surface of the mounting hole 36a and the outer peripheral surface of the cylindrical portion 31a, an annular passage 20e at the upper end of the medium diameter hole 36b, an inclined passage 20f communicating with the output port 41, and the like are provided.

  As shown in FIGS. 1 and 2, the valve drive mechanism 34 includes a mounting hole 36 a in the auxiliary rod 12, and a valve driving member that is movably mounted in the mounting hole 36 a in the axial direction and can open the valve body 32. 42, a pressure receiving portion 42a that is formed in the valve drive member 42 and receives the hydraulic pressure of the hydraulic working chamber 8b, and the piston member 3 and the valve drive member 42 via a steel ball 44 that contacts the cam portion 43 of the piston member 3. And a cooperating mechanism 45 for cooperating

  The cooperative mechanism 45 is formed in a holding hole 12a formed in the vicinity of the upper end of the auxiliary rod 12, a plurality of steel balls 44 held movably in the radial direction in the holding hole 12a, and the valve drive member 42. An annular engagement recess 42 b in which the steel ball 44 can be partially engaged and a cam portion 43 formed in the piston member 3 are provided. The valve drive member 42 includes a large diameter portion 42c, a small diameter rod portion 42d extending from the lower end of the large diameter portion 42c and inserted into the passage hole 37, and an annular engagement recess 42b. A seal member d is attached to the outer peripheral portion of the large diameter portion 42c, an annular engagement recess 42b is formed in the vicinity of the upper end of the large diameter portion 42c, and the hydraulic pressure of the hydraulic working chamber 8b is formed at the upper end portion of the large diameter portion 42c. That is, a pressure receiving portion 42a for receiving the hydraulic pressure in the rod insertion hole 13 is formed.

  A cam portion 43 is formed on the inner peripheral wall portion of the rod insertion hole 13. The cam portion 43 is connected to a steel ball pushing portion 43a that is an inner peripheral wall surface that pushes the steel ball 44 toward the annular engagement recess 42b, and a lower end of the steel ball pushing portion 43a. And an annular steel ball receiving portion 43b that can be accommodated in the housing. The steel ball pushing portion 43a has a length of about 70 to 80% of the total height of the rod insertion hole 13, for example. The steel ball receiving portion 43b is formed at a position corresponding to the steel ball 44 when the piston member 3 is positioned at the clamp start position (see FIG. 3).

  When the movement of the valve drive member 42 is restricted by pushing the steel ball 44 toward the annular engagement recess 42b by the steel ball pushing portion 43a, and the piston member 3 moves to a predetermined position (clamp start position), The steel ball 44 is accommodated in the steel ball receiving portion 43b, and the valve driving member 42 is in a state in which the valve body 32 can be driven to open. The valve drive mechanism 34 is configured to switch the valve body 32 to the valve opening position against the spring force of the valve closing spring 33 after the hydraulic pressure in the hydraulic working chamber 8b rises to a predetermined pressure.

Next, the operation and effect of the clamp device 1 will be described.
In the unclamped state shown in FIGS. 1 and 2, the piston member 3 is located at the lower limit position, and the plurality of steel balls 44 are moved to the axial center side of the valve drive member 42 by the steel ball pushing portion 43 a of the cam portion 43. It is pushed and engages with the annular engagement recess 42b to hold the valve drive member 42 at the upper limit position.

  Therefore, since the small diameter rod 42 d of the valve drive member 42 is separated from the upper surface of the valve body 32 by a small distance, the valve body 32 is closed by the urging force of the valve closing spring 33. Therefore, the fluid pressure supplied to the input port 40 is not output to the output port 41.

  When the hydraulic pressure is supplied to the hydraulic working chamber 8b while discharging the hydraulic pressure of the hydraulic working chamber 8a, the piston member 3 is raised and the clamp arm 4 is in the horizontal posture as shown in FIGS. When the start position is reached, the plurality of steel balls 44 are partially engaged with the steel ball receiving portion 43b of the cam portion 43, and the plurality of steel balls 44 are separated from the annular engagement recess 42b to the outside. Therefore, the valve drive member 42 is in a state in which the valve can be driven to move downward.

  As shown in FIGS. 5 and 6, at this time, the valve drive member 42 receives the hydraulic pressure of the rod insertion hole 13 in the pressure receiving portion 42a, and the clamp arm 4 is in a clamped state in which the object to be clamped is pressed. When the hydraulic pressure in the working chamber 8b (that is, the hydraulic pressure in the rod insertion hole 13) becomes equal to or higher than a predetermined pressure, the small-diameter rod 42d of the valve drive member 42 drives the valve body 32 downward to open the valve. As a result, the fluid pressure supplied to the input port 40 is output to the output port 41.

As described above, in the hydraulic cylinder 2 of the clamping device 1, the piston member 3 is moved to a predetermined position (clamp start position), and the hydraulic pressure in the clamping hydraulic operating chamber 8b is higher than the predetermined pressure. Since the sequence valve mechanism 30 is opened, it is possible to realize the sequence valve mechanism 30 that does not malfunction and is excellent in reliability and operational reliability.
Moreover, since the fluid passage 20 and the sequence valve mechanism 30 are arranged by effectively utilizing the internal space of the cylinder hole 11 and the piston member 3, the fluid passage 20 and the sequence valve mechanism are not increased in size. 30 can be incorporated.

  FIG. 7 shows an example of the fluid pressure circuit for the hydraulic cylinder 2, the sequence valve mechanism 30, and the external fluid pressure device. Hydraulic pressure is supplied to and discharged from the hydraulic cylinder 2 of the clamping device 1 from the hydraulic supply source 21 via the electromagnetic direction switching valve 22, and fluid pressure (this embodiment) is supplied from the fluid pressure supply source 23 to the input port 40 of the fluid passage 20. In the example, pressurized air) is supplied, and the output port 41 of the fluid passage 20 is connected to a pilot port 25 a of a pilot-type directional switching valve 25 that supplies and discharges fluid pressure to and from the fluid pressure cylinder 24. The fluid pressure cylinder 24 and the pilot-type direction switching valve 25 correspond to an external fluid pressure device.

  The sequence valve mechanism 30 is opened on the condition that the piston member 3 of the clamping device 2 moves to a position where it can be clamped and the hydraulic pressure in the hydraulic working chamber 8b becomes equal to or higher than a predetermined pressure. Fluid pressure (pressurized air) is supplied to the pilot port 25a, the pilot-type directional control valve 25 is switched, fluid pressure (hydraulic pressure) is discharged from the head-side fluid pressure working chamber of the fluid pressure cylinder 24, and rod-side fluid pressure. It is switched to a state where fluid pressure is supplied to the working chamber. Thus, the hydraulic passage 2 and the fluid pressure cylinder 24 can be reliably operated by the fluid passage 20 and the sequence valve mechanism 30.

Next, a clamp device 1A, a hydraulic cylinder 2A, and a sequence valve mechanism 30A according to the second embodiment will be described with reference to FIGS. However, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and only different configurations will be described.
In this sequence valve mechanism 30A, the hydraulic passage 16a connected to the hydraulic working chamber 8b is connected to the horizontal passage 20a on the input port 40A side, and the flow of fluid pressure in the discharge direction (from the passage hole 37 to the valve body 32A) A check valve 50 that allows a flow in the direction toward the hole 38) is incorporated.

  The valve body 32A includes a steel ball 51, a valve closing spring 52, a housing hole 53 for housing the steel ball 51 and the valve closing spring 52, a small diameter hole 54 formed in the upper end wall of the housing hole 53, and the small diameter hole. 54 and an annular valve seat on the outer peripheral side of the lower end. A plurality of vertical grooves 32g are formed on the outer periphery of the upper half of the valve body 32A. The valve body 32A is urged by the valve closing spring 33 in the valve closing direction (upward).

  Since the small-diameter rod 42d of the valve drive member 42 has a larger diameter than the small-diameter hole 54, the hydraulic pressure in the hydraulic working chamber 8b reaches the position where the piston member 3 of the hydraulic cylinder 2A can be clamped, as in the first embodiment. When the pressure exceeds the predetermined pressure, the sequence valve mechanism 30A opens. However, when the piston member 3 is in a position other than the clamped state, the fluid pressure is allowed to flow through the check valve 50 in the discharge direction, so that the fluid is not restricted by the position of the piston member 3. The pressure can flow in the discharge direction.

  FIG. 10 shows an example of the hydraulic cylinder 2A, its sequence valve mechanism 30A, and a fluid pressure circuit for an external fluid pressure device. Fluid pressure (hydraulic pressure) is supplied to the input port of the fluid passage 20A from the hydraulic passage 16a connected to the hydraulic operation chamber 8b, and a check valve 50 is incorporated in the sequence valve 30A. The fluid pressure cylinder 24A and the pilot-type direction switching valve 25A correspond to an external fluid pressure device.

  The sequence valve mechanism 30A is opened on condition that the clamp device 1A is in a clamped state, fluid pressure (hydraulic pressure) is supplied to the pilot port 25b, the pilot-type directional control valve 25A is switched, and the fluid pressure cylinder 24A The fluid pressure (hydraulic pressure) is discharged from the rod side fluid pressure working chamber, and the fluid pressure (hydraulic pressure) is supplied to the head side fluid pressure working chamber.

  Further, when the electromagnetic direction switching valve 22 is switched to the illustrated position and the clamping device 1A is switched to the unclamping side, the hydraulic pressure in the hydraulic working chamber 8b decreases, and therefore the sequence valve mechanism 30A is closed. However, since the fluid pressure in the pilot port 25b is discharged through the check valve 50, the pilot-type direction switching valve 25A is switched to the position shown in the figure, and the piston member of the fluid pressure cylinder 24A is driven in the retracted direction. It becomes like this. Thus, the hydraulic cylinder 2A and the fluid pressure cylinder 24A can be reliably linked by the fluid passage 20A and the sequence valve mechanism 30A.

  Next, a clamp device 1B, a hydraulic cylinder 2B, and a sequence valve mechanism 30 according to the third embodiment will be described with reference to FIGS. However, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and only different configurations will be described.

  In this hydraulic cylinder 2B, a hydraulic passage 16a connected to the hydraulic working chamber 8b is connected to a horizontal passage 20a on the input port 40B side, and a bypass fluid passage 20p is provided in the fluid passage 20a and discharged to the bypass fluid passage 20p. A check valve 50B that allows only the flow of hydraulic pressure in the direction is mounted. The bypass fluid passage 20p is provided so as to connect the horizontal passage 20a and the annular passage 20c, and a steel ball 51B and a compression spring 52B are mounted in a receiving hole formed in the bypass fluid passage 20p, and the steel ball 51B is a compression spring 52B. Thus, only the hydraulic flow from the annular passage 20c toward the horizontal passage 20a is allowed by being pressed against the annular valve seat at the end of the accommodation hole.

  FIG. 12 shows an example of the hydraulic cylinder 2B, its sequence valve mechanism 30, and a fluid pressure circuit for an external fluid pressure device. Hydraulic pressure is supplied / discharged from the hydraulic supply source 21 to the hydraulic cylinder 2B of the clamping device 1B via the electromagnetic direction switching valve 22, and the input port of the fluid passage 20B is connected to the hydraulic passage 16a connected to the hydraulic operation chamber 8b. Fluid pressure (hydraulic pressure) is supplied, the output port of the fluid passage 20B is connected to the head side fluid pressure working chamber of the fluid pressure cylinder 24B, and the rod side fluid pressure working chamber of the fluid pressure cylinder 24B is connected to the rod side of the hydraulic cylinder 2B. The hydraulic passage 16b is connected to the hydraulic working chamber 8a. The fluid pressure cylinder 24B corresponds to an external fluid pressure device.

  The sequence valve mechanism 30 is opened on the condition that the piston member 3 of the hydraulic cylinder 2B reaches a position where clamping is possible and the hydraulic pressure in the hydraulic working chamber 8b becomes equal to or higher than a predetermined pressure, and the fluid pressure cylinder 24B becomes the piston member. Drive in the direction to advance. When the electromagnetic direction switching valve 22 is switched to the illustrated position, the fluid pressure is supplied to the rod side fluid pressure working chamber of the fluid pressure cylinder 24B, while the fluid pressure (hydraulic pressure) of the horizontal passage 20a on the input port side is increased. Although the sequence valve mechanism 30 is closed to decrease, the fluid pressure (hydraulic pressure) in the head side fluid pressure working chamber of the fluid pressure cylinder 24B is discharged through the check valve 50B.

  Next, a clamp device 1C according to a fourth embodiment and its hydraulic cylinder 2C will be described with reference to FIGS. The hydraulic cylinder 2C includes a cylinder body 5C, a piston member 3C (output member) that is movably mounted on the cylinder body 5C, a fluid passage 20C formed in a wall portion of the cylinder body 5C, and a middle of the fluid passage 20C. And a sequence valve mechanism 30C that can be opened and closed.

  The clamp device 1C includes a turning mechanism 60 that turns the piston member 3C by 90 ° about its axis in conjunction with the lifting and lowering operation of the piston member 3C. A clamp arm 4C in a horizontal posture is detachably mounted on the upper end portion of the piston member 3C via a nut 3n. FIG. 13 shows a state where the piston member 3C is in the unclamping position, and the clamp arm 4C extends rearward in the direction perpendicular to the paper surface. FIG. 15 shows a state in which the piston member 3C is in the clamp position, and the clamp arm 4C extends to the left.

The piston member 3C includes a piston portion 3p, an output rod 3q extending upward from the piston portion 3p, and an auxiliary rod 3s extending downward from the piston portion 3p. A rod insertion hole 13C into which the auxiliary rod 3s can be inserted is formed in the head side end wall member 5L.
The turning mechanism 60 includes three steel balls 60a held on the inner peripheral wall portion at the top of the rod insertion hole 13C, and three steel balls 60a formed so that the steel balls 60a are partially engaged with the outer peripheral portion of the auxiliary rod 3s. This is a known turning mechanism having a guide groove 60b.

  A rod hole 10C and a cylinder hole 11C connected to the lower end of the rod hole 10C are formed in the cylinder body 5C, and the lower end side of the cylinder hole 11C is closed by the head side end wall member 5L. A seal member 10a and a dust seal 10b are mounted on the inner periphery of the rod hole 10C. A hydraulic working chamber 8c for clamping is formed above the piston portion 3p in the cylinder hole 11C, and an hydraulic working chamber 8d for unclamping is formed below the piston portion 3p. The head side end wall member 5L has substantially the same thickness as the lower half portion of the cylinder body 5C, and an upper portion of about 3/4 of the head side end wall member 5L is formed in a fitting hole 11a extending downward from the cylinder hole 11C. The annular groove 5m is formed on the outer peripheral side of the lower end portion of the head side end wall member 5L, and the ring member 5n attached to the annular groove 5m is screwed into the screw hole 11b at the lower end portion of the cylinder body 5C. Thus, the head side end wall member 5L is fixed.

An annular groove 20h is formed in the middle portion of the fitting hole 11a, and seal members d and e are mounted on the inner peripheral part of the fitting hole 11a on both upper and lower sides of the annular groove 20h.
A first hydraulic pressure supply port 61 and a second hydraulic pressure supply port (not shown) are formed in the cylinder body 5C, and a hydraulic passage 61a extending from the first hydraulic pressure supply port 61 is connected to the hydraulic pressure working chamber 8c for clamping. 2 A hydraulic passage extending from the hydraulic pressure supply port is connected to the hydraulic working chamber 8d. A fluid passage 20C is formed in the wall of the cylinder body 5C, an input port 40C at one end of the fluid passage 20C is connected to the hydraulic passage 61a, and the other end of the fluid passage 20C is connected to an external fluid pressure device. .

A sequence valve mechanism 30C capable of opening and closing a middle portion of the fluid passage 20C is provided.
The sequence valve mechanism 30C includes a valve body 32C that can open and close the fluid passage 20C, a valve closing spring 33C that urges the valve body 32C toward the valve closing side, and a piston member 3C at a predetermined position (clamp start position shown in FIG. 15). And a valve drive mechanism 34C that enables the valve body 32C to be driven to open by the fluid pressure (hydraulic pressure) in the hydraulic working chamber 8c.

The valve drive mechanism 34C is configured to switch the valve body 32C to the valve opening position after the fluid pressure (hydraulic pressure) in the hydraulic working chamber 8c has increased to a predetermined pressure.
The valve drive mechanism 34C is mounted to the mounting hole 36d formed in the wall portion of the head side end wall member 5L outside the rod insertion hole 13C, and is mounted to be movable in the axial direction in the mounting hole 36d and opens the valve body 32C A possible valve drive member 42C, an annular pressure receiving portion 42m formed on the valve drive member 42C and receiving the fluid pressure (hydraulic pressure) of the hydraulic working chamber 8c, and a steel ball 44 that contacts the cam portion 43C of the piston member 3C. And a cooperating mechanism 45C for cooperating the piston member 3C and the valve driving member 42C.

  The fluid passage 20C includes a lateral fluid passage 20g connected to the hydraulic passage 61a and connected to the annular groove 20h, an annular groove 20h, a through passage 20i formed on the side wall of the attachment hole 36d, an attachment hole 36d, and an attachment. An output passage 20j connected to the lower end of the hole 36d, an output port 41C connected to the output passage 20j, and the like are provided. An annular valve seat 62 positioned on the outer peripheral side of the output passage 20i is formed on the upper surface of the lower end wall portion of the mounting hole 36d. The valve body 32C has a head portion 32d, a shaft portion 32e, and a valve portion 32f formed at the lower end of the shaft portion 32e, and is mounted on the lower end portion of the valve drive member 34C so as to be movable up and down.

  A holding hole 64 and a small diameter hole 65 connected to the lower end of the holding hole 64 are formed in the lower end portion of the valve drive member 34C. The head 32d of the valve body 32C is held in the holding hole 64 so as to be movable up and down, the shaft part 32e extends downward through the small diameter hole 65, the valve part 32f is positioned near the lower end of the mounting hole 36d, and the valve drive member 34C. The valve body 32C is biased toward the valve closing side (downward) by a valve closing spring 33C externally mounted on the shaft portion 32e between the lower end of the valve 32f and the valve portion 32f. An annular valve surface 63 that can be in close contact with the annular valve seat 62 is formed on the outer peripheral portion of the lower surface of the valve portion 32f.

  The cooperative mechanism 45C has a holding hole 45h formed in a wall portion between the rod insertion hole 13C and the mounting hole 36d in the head side end wall member 5L, and is held movably in the radial direction by the holding hole 45h. One steel ball 44, an annular engagement recess 42b formed in the valve drive member 34C and partially engageable with the steel ball 44, and a cam portion 43C formed in the outer peripheral portion of the auxiliary rod 3s of the piston member 3C. And.

  The cam portion 43C includes a steel ball pushing portion 43d that pushes the steel ball 44 toward the annular engagement recess 42b, and a steel ball receiving portion 43e that can partially accommodate the steel ball 44. The steel ball receiving portion 43e is configured by a vertical groove formed in the outer peripheral portion of the auxiliary rod 3s so as to face the steel ball 44 when the piston member 3C is in a state in which the clamping object W can be clamped. The vertical length of the steel ball receiving portion 43e is about half of the movable stroke of the piston member 3C. The steel ball pushing portion 43d is formed of a spiral groove having a small depth formed in a lower portion of the outer peripheral portion of the auxiliary rod 3s than the steel ball receiving portion 43e. Note that the steel ball pushing portion 43d does not need to be constituted by a vertical groove, and may be constituted by a part of the outer peripheral surface of the auxiliary rod 3s.

  The movement of the valve drive member 34C is restricted by pushing the steel ball 44 toward the annular engagement recess 42b by the steel ball pushing portion 43d, and the piston member 3C is in a predetermined position (clampable position in this embodiment). When the steel ball 44 is moved to the position, the steel ball 44 is partially accommodated in the steel ball receiving portion 43e, and the valve driving member 34C can drive the valve body 32C to open. Thereafter, the hydraulic pressure of the clamping hydraulic operating chamber 8c acts on the annular pressure receiving portion 42m to move the valve drive member 34C upward, so that the valve body 32C is opened away from the annular valve seat 62, and the hydraulic operating chamber is opened. A hydraulic pressure equal to the hydraulic pressure of 8c is output to the output port 41C.

  Therefore, by supplying fluid pressure (hydraulic pressure) from the output port 41C to the external fluid pressure device, the hydraulic cylinder 2C and the external fluid pressure device can be operated in a coordinated manner.

Next, a modification in which the above embodiment is partially changed will be described.
(1) In the above embodiment, the hydraulic cylinder as a fluid pressure cylinder has been described as an example. However, the present invention can be similarly applied to an air cylinder as a fluid pressure cylinder.
(2) The structure of the cylinder body, the structure of the piston member, and the like show examples of 1 and 2, and the present invention can be applied to a hydraulic cylinder having various cylinder bodies and piston members other than these structures. The same can be applied.

(3) The structure of the sequence valve mechanism is merely an example, and the present invention can be similarly applied to a fluid pressure cylinder having various sequence valve mechanisms.
(4) The fluid pressure cylinder according to the present invention can be applied not only to fluid pressure cylinders of various clamping devices but also to fluid pressure cylinders equipped in various devices.
(5) Those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. .

2, 2A to 2C Hydraulic cylinder 3, 3C Piston member 5, 5C Cylinder body 8b, 8c Hydraulic working chamber 12a Holding hole 20, 20A-20C Fluid pressure passage 20p Bypass passage 21 Hydraulic supply source 23 Pressurized air supply source 30, 30A -30C Sequence valve mechanism 32, 32A-32C Valve bodies 33, 33C Valve closing springs 34, 34C Valve drive mechanism 35 Spring force adjusting members 36a, 36d Mounting holes 42, 42C Valve drive member 42a Pressure receiving portion 42b Annular engagement recess 43, 43C Cam part 43a, 43d Steel ball pushing part 43b, 43e Steel ball receiving part 44 Steel ball 45, 45C Cooperation mechanism 45h Holding hole 50, 50B Check valve

Claims (9)

In a fluid pressure cylinder comprising a cylinder body, an output member equipped to be able to advance and retreat in the cylinder body, and a fluid pressure working chamber for driving the output member to at least one of the advance side and the retract side,
A fluid passage formed in the wall of the cylinder body, one end connected to a fluid pressure supply source and the other end connected to an external fluid pressure device;
A sequence valve mechanism capable of opening and closing the middle part of the fluid passage,
The sequence valve mechanism includes a valve body that can open and close the fluid passage, a valve closing spring that urges the valve body toward a valve closing side, and a fluid pressure working chamber that moves when the output member moves to a predetermined position. A fluid pressure cylinder comprising: a valve drive mechanism that enables the valve body to be driven to open by the fluid pressure.   The valve drive mechanism is configured to switch the valve body to a valve opening position against a spring force of the valve closing spring after the fluid pressure in the fluid pressure working chamber rises to a predetermined pressure. The fluid pressure cylinder according to claim 1. The valve drive mechanism is
A mounting hole formed in the wall of the cylinder body;
A valve drive member that is movably mounted in the mounting hole in the axial direction and capable of opening the valve body;
A pressure receiving portion formed on the valve drive member and receiving the fluid pressure of the fluid pressure working chamber;
3. The fluid pressure cylinder according to claim 2, further comprising: a cooperating mechanism that cooperates the output member and the valve driving member via a steel ball that abuts on a cam portion of the output member. The cooperating mechanism includes a holding hole formed in the cylinder body, a steel ball held movably in the radial direction in the holding hole, a valve driving member, and the steel ball partially engaged A possible annular engagement recess and a cam portion formed in the output member;
The cam portion includes a steel ball pushing portion that pushes the steel ball toward the annular engagement concave portion, and a steel ball receiving portion that can partially accommodate the steel ball, and the steel ball pushing portion. The movement of the valve drive member is restricted by pushing the steel ball toward the annular engagement recess, and the steel ball is accommodated in the steel ball receiving portion when the output member moves to a predetermined position. The fluid pressure cylinder according to claim 3, wherein the valve driving member is in a state in which the valve body can be driven to open.   The fluid pressure cylinder according to claim 1, wherein a spring force adjusting member capable of adjusting a spring force of the valve closing spring is provided.   2. The fluid pressure cylinder according to claim 1, wherein an upstream side of the sequence valve mechanism in the fluid passage communicates with the fluid pressure working chamber.   The fluid pressure cylinder according to claim 1, wherein a check valve that allows a flow of fluid pressure in a discharge direction is incorporated in the valve body.   The bypass passage for bypassing the sequence valve mechanism is provided in the fluid passage, and a check valve for allowing the flow of fluid pressure in the discharge direction is provided in the bypass passage. Fluid pressure cylinder.   The fluid pressure cylinder according to claim 1, wherein the predetermined position is a clamp position in a fluid pressure cylinder for driving a clamp device.